Among them was this awesome adding and subtracting machine. It even has a stylus that is hidden until you pull out the reset lever (lower right). To add, you dial your number clockwise using the large numbers. To subtract you dial it counterclockwise using the smaller numbers. Pretty ingenious. I remember my grandpa showing me how to use this and letting me play with it when I visited as a child. Great memories. It has a place of honor on the shelf in my office now.
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